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Hemoglobin Blood Test: Normal Levels & What Your Results Mean

Hemoglobin is the protein in red blood cells responsible for carrying oxygen from your lungs to every cell in your body. It is the primary marker used to diagnose anemia and assess overall oxygen-carrying capacity.

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Normal Range

13.5 – 17.5 g/dL (men), 12.0 – 15.5 g/dL (women)

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Unit

g/dL

What Your Results Mean

Normal

Normal hemoglobin indicates your blood can carry sufficient oxygen to meet your body's needs, supporting energy levels, physical performance, and organ function.

High

High hemoglobin can result from dehydration, living at high altitude, smoking, or conditions like polycythemia vera where the body overproduces red blood cells.

Low

Low hemoglobin (anemia) causes fatigue, shortness of breath, pale skin, dizziness, and poor concentration. Common causes include iron deficiency, vitamin B12 or folate deficiency, blood loss, or chronic disease.

Frequently Asked Questions

What is a normal hemoglobin level? expand_more

Normal hemoglobin is 13.5–17.5 g/dL for men and 12.0–15.5 g/dL for women. Values below these ranges indicate anemia.

What causes low hemoglobin? expand_more

The most common causes are iron deficiency, vitamin B12 or folate deficiency, chronic kidney disease, blood loss from injury or heavy periods, and inflammatory conditions.

Can low hemoglobin be dangerous? expand_more

Mild anemia is manageable but severe hemoglobin deficiency can cause heart strain and organ damage. Always discuss significantly low results with your doctor.

How can I raise my hemoglobin naturally? expand_more

Eat iron-rich foods, increase vitamin B12 and folate intake, and treat any underlying causes. Supplementation may be needed depending on severity.

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